Question

A public opinion poll in Virginia wants to determine whether registered voters in the state approve of a measure to ban smoking in all indoor restaurants in the interest of public health. The researchers select a simple random sample of 5 counties and then sample all registered voters from each selected county and ask whether they approve or disapprove of the measure. This is an example of:
A. A simple random sample
B. A multistage sample
C. A stratified sample.
D. A cluster sample
E. A systematic sample

Answer 1

Answer:

C. A stratified sample.

Explanation:

Stratified sample: This is a type of sampling method used in the research method.

In stratified sampling, the experimenter or researcher divides a given population into different groups, named as strata. After diving the population into different groups, the researcher draws a probability sample from each group.

Advantage: Provides greater precision compared to a simple random sample of the same size.